feat: fix N+1 problem#505

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feat/n+1-improvements

Commits on May 23, 2026

feat: fix N+1 problem
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feat: fix N+1 problem
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fix(serializer): restore allowed_access_levels key in PresentationCategorySerializer (typo '.')
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feat(repository): extend DoctrineRepository::getAllByPage with N+1 batch-load support
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chore(repository): replace time() with microtime(true) and add per-phase timing in getAllByPage
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fix(repository): remove redundant et2 join from hydration query in getAllByPage
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fix(serializer): eliminate speaker lazy-loads and enable presentation cache in getEvents
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fix(serializer): add last_edited timestamp to presentation cache key for automatic invalidation
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chore(debug): add serializer timing logs to getEvents and PagingResponse::toArray
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fix(serializer): force-initialize EXTRA_LAZY collections and pre-load speaker Member
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fix(graph-loader): use em->find() instead of tryGetById for EXTRA_LAZY force-init
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fix(graph-loader): correct tryGetById call for EXTRA_LAZY collection force-init
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fix(serializer): pre-load PresentationSpeaker + Member in single DQL query
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feat(serializer): add Redis cache to SummitEventSerializer
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fix(serializer): include media_uploads serializer type in cache key, skip re-serialization on hit
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chore(debug): remove per-item and per-phase diagnostic logging
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fix(serializer): collapse Cache::has+Cache::get into single Cache::get for cache lookup
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